Mattress



FIG. 1 is a left side, top perspective view of a mattress embodying my design in accordance with one embodiment;

FIG. 2 is a rear elevational view depicting a head end of the mattress;

FIG. 3 is a front elevational view depicting a foot end of the mattress;

FIG. 4 is a right-side elevational view of the mattress;

FIG. 5 is a left-side elevational view of the mattress; and,

FIG. 6 is a bottom plan view of the mattress.

The broken lines represent features of the mattress that form no part of the claim. 

CLAIM We claim the ornamental design for a mattress, as shown and described. 